在做周围血管检查时，应使多普勒声束与血管的夹角（     ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25733' and id < 2163129 and id<>'2163129' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25733' and id > 2163129 and id<>'2163129' order by id asc limit 5